It's not any of those. Nothing macro about those changes to me. Maybe if the skull changes into a mouse, I'd see macro.
That's not the way evolution works, but even if such a transistional series was shown to you, wouldn't you just say the skulls are just humans, apes and mice?
The hominid series seems undramatic to you. But if anyone made a similar display for primitive primates to monkeys to early apes, it would be similarly undramatic.
Same thing for the record from early placental insectivores to primates. Here's another series, farther back down the tree. How dramatic does this look?